Differential engine



Aug. 21, 1934.

R. J. PARSONS DIFFERENTIAL ENGINE 1 Filed Sept. fllesz 2 Sheets-Sheet l I i v Robert JParmig 'AmRN INVENTOR Aug. 21, 19 34.

R. J. PARSONS DIFFERENTIAL ENGINE Filed Sept. 1, 1952 2 Sheets-Sheet 2 IIIIIIIIIIIIIIIIIIIIIIII)! INVENTOR Robert JPanmns BY v ATTORNEY Patented Aug 21, 1934 n I unirso 'srnrrs PATENT oFFicEI 1,97Ld48 nrrranrirrmr. ENGINE Robert I? Parsons, Schenectady, N. Y assignmto Consolidated Car-Heating Company, 1110., Albany, N. Y., a corporation oi New York Application September l, 1932, Serial-No. crises Claims. (oi. izi-isi For a detailed description of the present form J and closes it, leaving only the restricted by- I of my invention, reference may be had to the iolpass L for the escape of fluid from cylinder A. a lowing specification and to the accompanying The action of the engine isasiollows: Pressure 7 I drawings forming a part thereof, wherein fluid, such as compressed air, is admitted to the Fig. l is a plan of my engine; two pistons by the aforesaid pipe E and is lrept to Fig. 2 E a diametrical section thereof; constantly on. Then, if air pressure is also ad- Fig. 3 and Fig. 4 are views of the respective cylmitted to the large cylinder A, it will counter, on

inder ends; the left side of piston A", the pressure exerted on Fig. 5 is a plan and its right side due to the air, admitted constantly m Fig. 6 a diametric section of the cylinder 0011- through the pipe E. Since the pressure on piston 1. struction. t A is balanced, the pressure will act on the smaller My device is a differential engine of the direct piston E and force it to the right, since the stroke type such as is used for opening or closing smaller piston is only opposed by atmospheric a door, or producing any analogous direct stroke. pressure on its right side. This action of piston w Referring to the drawings the engine is shown B will close the door through the shackle G. To an as provided with a cylinder having a large diamopen the door the air pressure is exhausted from eter A and, in continuation thereof, a cylinder of the larger cylinder A and the constant pressure smaller diameter '3. These two cylinders are in B, now acting on the larger piston A, will move open ended and their open ends face each other piston A to the left, pulling piston B? with it and at the center of the engine. These two parts A opening the door. As piston A moves to the left. and B are made of a single metal tube, as appears the rod N thereon encounters the valve J and clearly in Fig. 5 and Fig. 6, the larger portion of closes it. For the remainder of its stroke the pisthe tube serving normally for the larger diameton A is then retarded by the slow outflow of ter and is drawn down to a smaller diameter for air through the lay-pass L around the valve J the lesser part B. Inside of the smaller portion Wh t 1 1m as new and desire insecure by M B is placed a thinner lining tube C, which is L tt t t I longer than the swaged-down part of the tube and a In a pressure engine, a -m m haw projects into the said larger part A. This leaves m alportion of reduced diameter joined with a j a space D, Outside of the C but inside of portign of larger diameter an mtem edjate 39 A. This space D is utilized for admitting prestapered Zone, and w m lining for the w i sure to the inside of cylinder A and also the, intion of Smaller diameter, said mu having a side of C by means of an external tube E, shown free end extended t t tapered n said 1: in Fig. 2'. This space D communicates with C by flee d being paced fr m the adjacent want a passageway leading around the open end of C. f aid tubular. member, In the cylinder A is a correspondingly large pis- 2. In a pressure engine, a tubular member 90 ton A and in cylinder 33 a smaller piston B these having a portion '01 reduced diameter joined two pistons being connected to ea ch other by an with a portion of larger diameter by an intermeaxial rod F, which is continued on the outside diate pered zone, and a tubular lining for the o! piston B by a shackle G which is to be conportion of smaller diameter, said lining being nected to the door or other object to be operated. longer than said portion of smaller diameter 95 Piston A is encircled by a packing ring A and and having ai'ree end projected into said lnter-' piston B by a similar packing ring 13. The mediate zone, said projected end and the adjaouter end of the smaller cylinder is closed by a cent wall portion of the tubular member being head H and the outer end of the larger cylinder constructed and arranged to provide an annular 'by a head H Through the center of the latter fiuid-pressure-receiving cavity. 1 1 head, H is an axial passageway that is opened 3. In a pressure engine,. a tubular member or closed by a valve J operated by a spring J and having a portion of reduced diameter Joined with the said passageway leads into an external port a portion of larger diameter by an intermediate K through which pressure fluid may be admitted tapered zone, a tubular lining for the portion 105 to the inside of cylinder A when said valve J is of smaller diameter, said lining having a, free open. A by-passduct L around the valve J is 'end extended into the larger portion of said adjustable by a screw M. On the aforesaid pistapered zone, an annular fluid-pressure-r'eceivton A is a projecting rod N that, near the end ing cavity being formed between the free end of the leftward stroke of the piston, hits the valve of said lining and the adjacent wall of said no constructed bular member, and a pressure inlet pipe connected with said chamber.

4. In a pressure engine, a tubular member having a portion of reduced diameter joined with a portion of larger diameter by an intermediate tapered zone, so as to provide cylinders 01 different diameters, a tubular lining for the smaller cylinder, a head enclosing the outer end of the smaller cylinder and the adjacent end or the lining, the other endo! the lining being projected into the larger portion 0! said tapered zone and and arranged to provide an annular iiuid-pressure-receiving cavity between the lining and the adjacent wall of the tubular member, and a head engaging the outer end of the larger cylinder.

5. A pressure engine comprising two cylinders of different diameters, said cylinders consisting of a tubular member having a portion or reduced diameter Joined with a portion of larger diameter by an intermediate tapered zone, a piston reciprocably mounted in the larger cylinder, a second piston reciprocably mounted in the smaller cylinder, means connecting said pis a lining for the smaller cylinder, said lining having a free end extended into the larger portion of said tapered zone and constructed and arranged to provide an annular fluid-pressure-receiving cavity between the lining and the ad- -:lacent wall of the tubular member, said cavity communicating with the interior of the tubular member at a position v pressure inlet tube connected with said cavity.

. ROBERT J. PARSONS.

between the pistons, and a 

